The preferred (and easiest) way to upload teams and participants is via the Scenario Editor.

However, this can also be done by uploading a CSV file via the Facilitator Dashboard:
  1. Select Manage>Add Teams
  2. Upload CSV file
  3. Refresh the dashboard to see the changes after uploading. 

The new teams and participants will appear in the left-hand team column.

What's the format of the CSV file?

The CSV file format is shown below. If you export the teams from the Scenario Editor, you'll find an example.